Hi, Regarding the per webapp logging, when we use the http://wiki.jboss.org/wiki/Wiki.jsp?page=Log4jRepositorySelector approach it is not possible any more to do hot ear redeployments. Steps to reproduce : 1. start JBoss with the ear deployed 2. undeployed the ear 3. redeploy the ear ==> the application cannot be deployed and the whole app server is blocked. I don't understand why, when redeploying the ear, the Log4jLoggerPlugin tries to use the per webapp RepositorySelector. Of course it has not been initialized yet and it fails. See the stacktrace below. We got a NPE because the RepositorySelector was not initialized yet. However, I don't think the repository of the Log4jLoggerPlugin should have been modified. ****************stacktrace begins**************** java.lang.NullPointerException at org.jboss.repositoryselectorexample.MyRepositorySelector.getLoggerRepo sitory(MyRepositorySelector.java:87) at org.apache.log4j.LogManager.getLogger(LogManager.java:179) at org.apache.log4j.Logger.getLogger(Logger.java:85) at sun.reflect.GeneratedMethodAccessor29.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor Impl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.apache.commons.logging.impl.Log4jProxy.(Log4jProxy.java:132) at org.apache.commons.logging.impl.Log4JLogger.(Log4JLogger.java:39) at sun.reflect.GeneratedConstructorAccessor23.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingCons tructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:494) at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImp l.java:529) at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImp l.java:235) at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImp l.java:209) at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:353) at org.apache.commons.httpclient.HttpMethodBase.(HttpMethodBase.jav a:102) at sun.misc.Unsafe.ensureClassInitialized(Native Method) at sun.reflect.UnsafeFieldAccessorFactory.newFieldAccessor(UnsafeFieldAcces sorFactory.java:25) at sun.reflect.ReflectionFactory.newFieldAccessor(ReflectionFactory.java:12 2) at java.lang.reflect.Field.acquireFieldAccessor(Field.java:917) at java.lang.reflect.Field.getFieldAccessor(Field.java:898) at java.lang.reflect.Field.get(Field.java:357) at org.apache.catalina.loader.WebappClassLoader.clearReferences(WebappClass Loader.java:1608) at org.apache.catalina.loader.WebappClassLoader.stop(WebappClassLoader.java :1492) at org.apache.catalina.loader.WebappLoader.stop(WebappLoader.java:736) at org.apache.catalina.core.StandardContext.stop(StandardContext.java:4393) at org.apache.catalina.core.ContainerBase.destroy(ContainerBase.java:1132) at org.apache.catalina.core.StandardContext.destroy(StandardContext.java:44 49) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav a:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor Impl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.apache.commons.modeler.BaseModelMBean.invoke(BaseModelMBean.java:503 ) at org.jboss.mx.server.RawDynamicInvoker.invoke(RawDynamicInvoker.java:164) at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659) at org.jboss.web.tomcat.tc5.TomcatDeployer.performUndeployInternal(TomcatDe ployer.java:450) at org.jboss.web.tomcat.tc5.TomcatDeployer.performUndeploy(TomcatDeployer.j ava:421) at org.jboss.web.AbstractWebDeployer.stop(AbstractWebDeployer.java:418) at org.jboss.web.WebModule.stopModule(WebModule.java:100) at org.jboss.web.WebModule.stopService(WebModule.java:66) at org.jboss.system.ServiceMBeanSupport.jbossInternalStop(ServiceMBeanSuppo rt.java:315) at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBean Support.java:247) at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor Impl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher. java:155) at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94) at org.jboss.mx.server.Invocation.invoke(Invocation.java:86) at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.jav a:264) at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659) at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController .java:978) at $Proxy0.stop(Unknown Source) at org.jboss.system.ServiceController.stop(ServiceController.java:508) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav a:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor Impl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher. java:155) at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94) at org.jboss.mx.server.Invocation.invoke(Invocation.java:86) at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.jav a:264) at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659) at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210) at $Proxy38.stop(Unknown Source) at org.jboss.web.AbstractWebContainer.stop(AbstractWebContainer.java:498) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav a:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor Impl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher. java:155) at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94) at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor. java:133) at org.jboss.mx.server.Invocation.invoke(Invocation.java:88) at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBea nOperationInterceptor.java:142) at org.jboss.mx.interceptor.DynamicInterceptor.invoke(DynamicInterceptor.ja va:97) at org.jboss.system.InterceptorServiceMBeanSupport.invokeNext(InterceptorSe rviceMBeanSupport.java:238) at org.jboss.ws.integration.jboss.DeployerInterceptor.stop(DeployerIntercep tor.java:122) at org.jboss.deployment.SubDeployerInterceptorSupport$XMBeanInterceptor.sto p(SubDeployerInterceptorSupport.java:196) at org.jboss.deployment.SubDeployerInterceptor.invoke(SubDeployerIntercepto r.java:99) at org.jboss.mx.server.Invocation.invoke(Invocation.java:88) at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.jav a:264) at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659) at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210) at $Proxy39.stop(Unknown Source) at org.jboss.deployment.MainDeployer.stop(MainDeployer.java:667) at org.jboss.deployment.MainDeployer.stop(MainDeployer.java:659) at org.jboss.deployment.MainDeployer.undeploy(MainDeployer.java:638) at org.jboss.deployment.MainDeployer.undeploy(MainDeployer.java:632) at org.jboss.deployment.MainDeployer.undeploy(MainDeployer.java:615) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav a:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor Impl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher. java:155) at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94) at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor. java:133) at org.jboss.mx.server.Invocation.invoke(Invocation.java:88) at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBea nOperationInterceptor.java:142) at org.jboss.mx.server.Invocation.invoke(Invocation.java:88) at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.jav a:264) at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659) at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210) at $Proxy8.undeploy(Unknown Source) at org.jboss.deployment.scanner.URLDeploymentScanner.undeploy(URLDeployment Scanner.java:450) at org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScan ner.java:570) at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doS can(AbstractDeploymentScanner.java:263) at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.loo p(AbstractDeploymentScanner.java:274) at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.run (AbstractDeploymentScanner.java:225) ****************stacktrace ends**************** I also tried to copy the log4j.jar in the ./WEB-INF/lib/ of my webapp. Instead of getting a NPE, I got a ClassCastException. Is anybody succeeded in carrying out hot redeployments while having by per webapp logging? I look at all the forums and I don't think JBoss can do this. We are running JBoss 4.0.5. TIA Al View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4044988#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...